Grate



GRATE.

(NQ Model.)

Patented July 23, 1889.

(No Model.)v n 2 shens-sheet 2. H.P.TALLMADGEV y GRATE. Y No. 407,379.Patented July 23, 1889.

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HIRAM P. TALLMADGF., OF BOSTON, MASSACHUSETTS.

GRATE.

SPECIFICATION forming part of Letters Patent No. 407,379, dated July 23,1889.

Application filed September 17, 1888. Serial No. 285,561. (No model.)

To all whom it may concern:

Beit known that I, HIEAM P. TALLMADGE, of Boston, in the county ofSuffolk, State of Massachusetts, have invented a certain new and usefulImprovement in Grates, of which the following isa descriptionsufficiently full, clear, and exact to enable any person skilled in theart or science to which said invention appertains to make and use thesame, reference 'being had to the accompanying drawpart of thisspeciiication, in which* Figure lis a top plan view of my improved igrate detached; Figs. 2 and 3, enlarged side elevations of portions ofthe side bars, showing the method of mounting the rocking bars; Fig. 4,a sectional view, enlarged, taken on line a' in Fig. l; Fig. 5, avertical longitudinal section of the grate; Fig. 6, a sectional viewshowing an alternate method of pivoting the rocking bars. Fig. 7 is abottom plan view of this improved grate. Fig. S is a detail showing oneof the rocking bars, a tilting carriage thereon, a group of grate-barssupported on said carriage, and the adjoining group of grate-barssupported on bearings on said rocking bar.

Like letters and figures of reference indicate corresponding parts inthe different iigures of the drawings.

My invention relates to that class of grates which are provided withmovable grate-bars;

vand it consists in certain novel features, as

hereinafter fully set forth and claimed, the object being to produce asimpler and more effective device of this character than is now inordinary use.

The nature and operation of the improvement will be readily understoodby all conversant with such matters from the following explanation.

In the drawings, A B represent the Aside bars, C the front bar, D theback bar, and H the movable bars or grate-bars proper.

The side bars A B are provided on their upper edges withvertically-arranged transverse iian ges b, and are mortised at theirends to receive the front and back bars C D, by which they areconnected. The side bars are provided in their lower forward ends withcircular openings d, having knife-edge bearings f in their lowerportions.

The front rocking bar g is arranged horizontally across the grate and isdisposed in said openings upon the bearings f, said rock ing bar beingprovided centrally with a downwardly-projecting lug h, in which a curvedhandle K may be inserted for oscillating said bar. The rear rocking bart' is disposed in similar holes d in the rear ends of the side bars andrests upon knife-edge bearings f (see Fig. 4L) in the same manner as thebar g.

The grate-bars H are provided on their upper edges withtransversely-arranged upwardly -projecting flanges m, one of saidflanges at suitable intervals on said bars being extended and secured at7c to a corresponding fiange on an adjacent bar and being provided witha downwardlyprojecting web 65, extending to the bottom of said bars,thereby securely fastening the same together in groups consisting of twobars each.

I preferably cast the groups of bars inte gral in the form described,and arrange the ilanges m diagonally, as shown in Fig. l; but they maybe arranged at right angles to the body of the bars, if preferred.'

The body of each outer grate-bar H is provided on its lower edge with anotch Z, which is adapted to receive a knife-edge bearing p, (see Figs.4 and 5,) formed on the front rock ing bar g, for supporting saidgrate-bars, and

each alternate group is disposed in like manner on said front bar. Therear ends of said alternate groups of grate-bars are disposed in groovesq, (see Figs. 4 and 5,) formed in the upper side of a carriage t, whichrests upon a knife-edge bearing c, formed on the rear rocking bar e'.

The arrangement of the intermediate groups of grate-bars H is reversed,the second or middle group, as shown in Fig. 1, and every alternategroup thereafter being pivoted by knife-edge bearings p to the rearrocking bar fr', and having its forward end resting on a carriage t,disposed on bearings o, formed in the front rocking bar g, the purposeof this arrangement being to cause the alternate groups of grate-bars tomove in opposite directions when manipulated as hereinafter described.

The rockin g bar i is provided near each end with adownwardly-projecting lug 15, (see Figs. 4 and 5,) and connecting saidlug with IOO the forward portion of a grate-bar Il is a rod 25.

The front and back bars C D are provided on their upper sides withinwardly-proj ectin horizontally-arranged :iianges fw, formed indifferent lengths and designed to prevent t-he coal from interfering'with the movement of the grate-bars, the flanges being disposed betweenadjacent gratebars and extending downward to the bottom of said frontand back bars, respectively, their purpose being to prevent lateralmotion oi said gratesbars.

The connecting-flanges k of the grate-bars are provided with adownwardly-projecting web (35 between the two bars, lforming a group forthe purpose of directing a draft upward through the different portionsof the iire, instead of causing the iire to rush directly back againstthe bridge-wall of the lfurnace.

In the use of my improvement the handle K is inserted in the socketformed in the lug h and moved upward and downward. On the downwardmotion of the handle the rocking bar g is moved on its bea-rings f,causing the knife-edge bearings vp on said bar to throw the outergrate-bars forward, and the carriage t, supporting the rear ends of saidbars, to roll or tilt forward on its bearing r, the parts assuming theposition shown in Fig. 5. Meanwhile the rods 5, connecting saidgrate-bars with the lugs 15 on the rocking bar '11, causes said bar totilt backward on its bearings f and carry7 with it the middle orintermediate group of grate-bars, which are pivoted to said rocking bari by bearings 22, and rest on a earriage t on the front rockin gbarg, asdescribed, thereby causing alternate groups oi grate-bars to move inopposite directions in a manner that will be readily understood by allconversant with such matters withouta more explicit description.

On the upward motion of the handle K the outer groups of bars are forcedbackward and the middle group forced forward, assuming the positionshown in Fig. l.

I do not confine myself to connecting only two grate-bars ll by theextended iianges 7s, as shown, as the groups may consist of three ormore groups, if desired.

It will readilybe seen that when the flanges m are 'formed diagonally tothe body of the grate-bars, as shown, said bars will pass much moreeasily through the ashes ot the lire than when at right angles to saidbars; and in banking or drawing the tire the hoe will slide over-thediagonal flanges without hooking against them, and displace the ashesmuch easier.

ly grouping the bars, as described, the liability ot' their warping ortwisting is prac ti cally overcome, which is especially essential whenbars of great length are employed.

In the modification shown in Fig. (j the side bars A B are provided withan inwardly-pro jectin lug 35, having' a knife-edge bearingf, and therocking bar g provided witha socket 45, adapted to receive said bearing,the end of said bar having a lip to prevent it from slippinglongitudinally.

llaving thus explained my invention, what I claim is# l. ln a grate, thecombination ot' side bars, end bars connecting the side bars, rockingbars pivotally connected with the side bars, tiltin carriages pivoted onsaid rocking bars, and grate-bars supported at their opposite endson'said rocking bars and carriages, re spectively, substantially asdescribed.

2. In a grat-e, the combination of side bars connected by end bars,grate-bars, rocking bars pivoted on knife-edge bearings in each end otsaid side bars, knife-edge bearings on said rocking bars for receivingan end of each group of grate-bars, and tilting carriages pivoted onsaid rocking bars for supporting the opposite ends of said grate-bars,whereby the grate-bars may be moved in opposite directions when saidrocking bars are rotated, substantially as described.

3. In a gra-te, the combination ot' the side bars A B, connected by thebars CD, the rockingbars g yi, pivoted in said side bars and providedwith the knife-edge bearings p r, the tilting carriages t, disposed onthe bearings r, lthe grate-bars ll, disposed at one end on a carriage tand at the opposite end on a bearing p, and the rod 25, for connectingone or more of said groups, with a lug l5 on the bar i, whereby thegrate-bars may be moved in opposite directions as said rocking bars arerotated, substantially as set forth.

l HRAM P. 'iAl'iLMADGE Witnesses:

O. M. SIL-iw, E. M. SriNNEY.

IOO

